High severity · published Jul 8, 2026
CVE-2026-58656
Grav API Plugin - Cross-Origin Admin Account Takeover via CORS Wildcard and JWT Query Parameter
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
Grav API plugin before v1.0.0-rc.16 accepts JWT tokens via the ?token= URL query parameter and responds with Access-Control-Allow-Origin: *, allowing unauthenticated attackers to make fully authenticated cross-origin API requests from any malicious website. Attackers who obtain a leaked JWT token from access logs, proxy logs, browser history, or Referrer headers can create persistent backdoor super-admin accounts and exfiltrate sensitive configuration and user data.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav · getgrav
through 1.0.0-rc.15 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58656
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-58656
github.com
https://github.com/getgrav/grav/security/advisories/GHSA-hqm9-5xxw-4qxp
www.vulncheck.com
https://www.vulncheck.com/advisories/grav-api-plugin-cross-origin-admin-account-takeover-via-cors-wildcard-and-jwt-query-parameter
More from grav
9.9
CVE-2024-34082
Grav is a file-based Web platform
9.8
CVE-2026-80203
Grav before 1.0.18 Authentication Bypass via Scoped API Key
9.8
CVE-2026-56710
Grav Login Plugin before 1.0.16 Privilege Escalation via Unlock
9.8
CVE-2026-65008
Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData
9.8
CVE-2021-47812
GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)